Biology 4BI1/1B May June 2020

Edexcel IGCSE Biology (4BI1) Nov 2020

معلم موافق رایگان بودن است.

1. Bacterial Evolution and Adaptation: H. pylori survival in stomach acid, enzyme urease function, natural selection leading to acid resistance, and probiotic effects on bacterial reduction.

2. Plant Reproduction and Pollination: Flower structure, pollen tube formation, differences between wind and insect pollination, and fertilization in plants.

3. Cell Biology and Energy Use: Mitochondrial count in heart, sperm, and egg cells, ATP production, metabolic requirements of cells, and calculation of organelle density.

4. Ecosystems and Food Webs: Antarctic food chain, energy transfer efficiency, krill feeding impact, experimental design for microscopic plant removal rates, and climate change effects on whale populations.

5. Genetic Modification and Agriculture: Agrobacterium in plant transformation, pros and cons of GM crops, recombinant DNA technology, and farmer decision-making on pest control.

6. Respiration and Experimental Biology: Aerobic respiration in locusts, respiration rate measurement, variable control in biological experiments, and reliability of experimental data.